Even a beautifully white smile can lose its youthful appearance if dark spaces begin appearing between the teeth near the gumline. These small openings, commonly called black triangles, are one of the most common cosmetic concerns patients mention during smile consultations.

Although black triangles may seem like a minor aesthetic issue, they can make teeth appear older, trap food, affect speech, and sometimes indicate underlying gum or bone loss.

The good news is that today’s cosmetic and restorative dental treatments offer several effective solutions.

At Marielaina Perrone, DDS, treatment begins by identifying why black triangles have developed before recommending the most conservative option to restore both the appearance and health of your smile.

What Are Black Triangles?

Black triangles are the dark spaces that appear between two adjacent teeth when the gum tissue no longer completely fills the area beneath the contact point.

Dentists refer to these spaces as open gingival embrasures.

Ideally, healthy gum tissue fills these spaces completely.

When that tissue recedes—or the shape or position of the teeth changes—the dark triangular space becomes visible.

While they most commonly affect the front teeth, black triangles may develop anywhere in the mouth.

Why Do Black Triangles Develop?

Several factors may contribute to their appearance.

Gum Recession

The most common cause is gum recession.

As gum tissue gradually recedes, the small triangle of tissue between neighboring teeth (the interdental papilla) may shrink, leaving a visible space.

Contributors include:

• Periodontal disease
• Aging
• Smoking
• Aggressive brushing
• Thin gum tissue
• Genetics

Bone Loss

Healthy gum tissue depends on healthy bone support.

When bone surrounding the teeth is lost because of periodontal disease or other conditions, the gum tissue may no longer completely fill the space between teeth.

This often creates progressively larger black triangles.

Tooth Shape

Not all teeth are naturally shaped the same.

Triangular-shaped teeth naturally contact each other closer to the biting edge, leaving more room near the gums.

Even with perfectly healthy gums, some patients are genetically more likely to develop black triangles.

Orthodontic Treatment

Braces and clear aligners create healthier tooth alignment, but moving teeth into proper position may occasionally reveal spaces that were previously hidden by overlapping teeth.

Fortunately, these situations are often correctable.

Dental Restorations

Old crowns, worn fillings, or restorations that no longer fit properly may also contribute to the appearance of black triangles.

Why Black Triangles Matter

Many people believe black triangles are simply cosmetic.

In reality, they may also:

• Trap food more easily
• Increase plaque accumulation
• Make flossing difficult
• Affect speech
• Create the appearance of aging
• Signal gum disease or bone loss

Determining the underlying cause is essential before deciding on treatment.

Can Black Triangles Be Fixed?

In many cases, yes.

Treatment depends entirely on the cause, size, and location of the spaces.

After a comprehensive examination, Dr. Perrone may recommend one or more of the following options.

Cosmetic Dental Bonding

For many patients, cosmetic bonding is the most conservative treatment.

Tooth-colored composite resin is carefully sculpted to close small spaces while preserving healthy tooth structure.

Benefits include:

• Completed in one visit
• Minimally invasive
• Affordable
• Natural appearance
• Little or no enamel removal

Porcelain Veneers

For patients seeking a complete smile makeover, porcelain veneers may be the ideal solution.

Veneers allow Dr. Perrone to:

• Close black triangles
• Improve tooth shape
• Brighten discolored teeth
• Correct minor alignment concerns
• Create overall smile symmetry

This comprehensive approach often transforms multiple cosmetic concerns simultaneously.

Orthodontic Treatment

If tooth position contributes significantly to black triangles, Invisalign® or other orthodontic treatment may improve spacing before cosmetic refinement.

Sometimes orthodontics alone resolves the issue.

Periodontal Treatment

When gum disease is responsible, healthy gums must be restored before cosmetic treatment begins.

Professional periodontal therapy may include:

• Scaling and root planing
• Periodontal maintenance
• Improved home care
• Management of inflammation

Healthy gums create the best long-term cosmetic results.

Hyaluronic Acid Therapy

In carefully selected cases, hyaluronic acid may temporarily improve small black triangles by supporting the soft tissues between teeth.

Not every patient is a candidate, and results vary depending on anatomy.

Gum Grafting

For advanced gum recession, periodontal surgery may be recommended to restore gum tissue and improve both function and appearance.

Can Black Triangles Be Prevented?

Although not every case can be prevented, healthy daily habits greatly reduce risk.

Dr. Perrone recommends:

• Brush gently using a soft-bristled toothbrush.
• Floss every day.
• Keep regular professional cleanings.
• Treat gum disease early.
• Avoid tobacco products.
• Wear a nightguard if you grind your teeth.
• Schedule regular dental examinations.

Early treatment often prevents black triangles from becoming more noticeable over time.

Dr. Perrone’s Perspective

“Black triangles may seem like a small detail, but they can have a surprisingly large impact on the overall appearance of a smile. The key is identifying why they’re present before choosing treatment. Every smile is unique, and the most beautiful results come from conservative, personalized solutions that restore both health and harmony.”
— Marielaina Perrone, DDS

Why Patients Choose Marielaina Perrone, DDS

Since 1999, Dr. Perrone has combined advanced cosmetic dentistry with a conservative philosophy that preserves healthy tooth structure whenever possible.

Patients appreciate her:

• Artistic smile design
• Personalized treatment planning
• Conservative cosmetic approach
• Modern dental technology
• Gentle care
• Natural-looking results

Every smile is carefully designed to complement the individual—not simply to create whiter teeth.

Frequently Asked Questions

Are black triangles a sign of gum disease?

Not always. While periodontal disease is a common cause, black triangles may also result from tooth shape, orthodontic treatment, aging, or natural anatomy.

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Can cosmetic bonding close black triangles?

Yes. Small to moderate black triangles are often successfully treated with tooth-colored cosmetic bonding.

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Do porcelain veneers eliminate black triangles?

In many cases, yes. Veneers can reshape teeth and close spaces while improving the overall appearance of the smile.

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Will braces make black triangles worse?

Sometimes orthodontic treatment reveals spaces that were hidden by overlapping teeth. These spaces can often be addressed with cosmetic treatment after orthodontics is complete.

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Can brushing too hard cause black triangles?

Aggressive brushing may contribute to gum recession over time, which can increase the risk of developing black triangles.

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What is the best treatment?

The best treatment depends on the underlying cause. A comprehensive examination allows Dr. Perrone to recommend the most conservative and effective solution.

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Restore a Healthy, Natural-Looking Smile

Black triangles don’t have to define your smile.

Whether caused by gum recession, tooth shape, or previous orthodontic treatment, today’s cosmetic dentistry offers beautiful, conservative solutions that restore confidence while preserving healthy teeth.

If you’ve noticed spaces appearing between your teeth, schedule a consultation with Marielaina Perrone, DDS to learn which treatment is best for your smile.

Medically Reviewed By

Marielaina Perrone, DDS
Doctor of Dental Surgery | Cosmetic, Restorative & Family Dentist
Henderson, Nevada

Dr. Marielaina Perrone has been practicing dentistry since 1999 and has completed extensive continuing education in cosmetic dentistry, restorative dentistry, smile design, implant dentistry, and minimally invasive treatment techniques. She emphasizes evidence-based care and individualized treatment planning to improve both oral health and smile aesthetics.

Updated: July 2026

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About the Author

Marielaina Perrone, DDS is an award-winning cosmetic and restorative dentist serving Henderson, Green Valley, Anthem, Seven Hills, Inspirada, Las Vegas, and surrounding Southern Nevada communities. A graduate of Stony Brook University School of Dental Medicine, she is recognized for creating natural-looking smile transformations through personalized cosmetic dentistry. Her philosophy centers on preserving healthy tooth structure while designing smiles that enhance confidence, facial harmony, and long-term oral health.